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US 8,585,286 B2Granted
Spectral detector calibration
AssigneeKoninklijke Philips N.V.
InventorsAmir Livne, Naor Wainer, Jens-Peter Schlomka, Ewald Roessl, Roland Proksa
Life of this patent
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Abstract
A method includes detecting radiation that traverses a material having a known spectral characteristic with a radiation sensitive detector pixel that outputs a signal indicative of the detected radiation and determining a mapping between the output signal and the spectral characteristic. The method further includes determining an energy of a photon detected by the radiation sensitive detector pixel based on a corresponding output of the radiation sensitive detector pixel and the mapping.
Claims30
A method, comprising:
- detecting generated radiation that traverses a material having a known spectral attenuation or fluorescence characteristic with a radiation sensitive detector pixel that outputs a signal indicative of the detected radiation,
- wherein the radiation is generated by an imaging system, the material is located in a filter tray of the imaging system, and the filter tray is movable to selectively move the material into and out of the generated radiation;
- counting a number of times a peak amplitude of the output signal exceeds each of a plurality of different thresholds corresponding to an output range of the detector pixel;
- and
- determining a mapping between the output signal of the pixel and the known spectral characteristic, wherein the mapping is based on a distribution of the counts over the output range.
2 more elements
An imaging system, comprising:
- a radiation source that emits radiation that traverses an examination region;
- a tray located near the radiation source, wherein the tray includes a material with known spectral characteristics, and the tray is movable to selectively position the material in a path of the emitted radiation;
- a spectral detector that detects radiation that traverses the material and the examination region;
- a calibration component that calibrates the spectral detector based on the detected radiation;
- a count accumulator that accumulates counts representing a number of times a peak value of the output signal exceeds each of a plurality of different threshold values;
- and
- a mapper that maps a peak value of the accumulated counts to a k-edge energy of the material, wherein the calibration component generates a calibration for the spectral detector based on the mapping.
4 more elements
A method for calibrating a detector array of an imaging system, comprising:
- detecting fluorescence radiation having a known spectral characteristic with a radiation sensitive detector pixel of the detector array, which outputs a signal indicative of an energy of the detected fluorescence radiation;
- determining a mapping between the output signal and the known spectral characteristic;
- wherein the mapping is based on a distribution of counts over an output range of a detector pixel detecting the radiation;
- and
- determining a calibration for the detector array of the imaging system based on the mapping.
2 more elements
An imaging system, comprising:
- a radiation source that emits first radiation that traverses an examination region;
- a detector array that detects the first radiation and generates a signal indicative thereof;
- a detector calibration apparatus;
- including:
- a radiation block that blocks the first radiation from illuminating the detector array;
- and
- at least one target that receives the first radiation and generates second radiation that includes a known spectral characteristic and that illuminates the detector array;
- and
- a calibration component that generates a calibration for the detector array based on an identified known spectral characteristic of the second radiation and a pre-determined spectral characteristic of the target.
6 more elements
A system, comprising:
- a detector calibration apparatus;
- including:
- a radiation block that blocks first radiation from illuminating a detector array, wherein the first radiation is emitted by a radiation source and traverses an examination region and the detector array detects the first radiation and generates a signal indicative thereof;
- and
- at least one target that receives the first radiation and generates second radiation that includes a known spectral characteristic and that illuminates the detector array;
- and
- a calibration component that generates a calibration for the detector array based on an identified known spectral characteristic of the second radiation and a pre-determined spectral characteristic of the target.
4 more elements
Dependencies are inferred from the claim text.